/* 响应式容器 */
.container{
  width: 100%;
  margin: 0 auto;
  padding: 15px;
}
@media screen and (min-width:768px){
  .container{
    width: 750px;
  }
}
@media screen and  (min-width:992px){
  .container{
    width: 970px;
  }
}
@media screen and  (min-width:1200px){
  .container{
    width: 1170px;
  }
}
@media screen and (min-width:1920px){
  .container{
    width: 1900px;
  }
}
